.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: .3rem;
    background-color: #46b8da;
  
    h1 {
      text-align: center;
      line-height: .44rem;
      font-size: .18rem;
      color: #fff;
    }
  
    .icon {
      position: absolute;
      top: .08rem;
      right: .15rem;
      color: #fff;
    }
  }